Electrical warp stop motion for looms



Mar. 5, 1929. s, TURN'ER ELECTRICAL WARFSTOP MOTION FOR LOOMS Filed Dec. 21, 1927 I .[lV/IZO/ kg] Eda/"d G Zzmer Patented Mar. 5, 1929.

barren STATES PATENT or I 1,703,911 i s- RIOHARD Gr. TURNER, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROM PTON &

KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS. A CORPORATION OF MASSACHUSETTS.

ELECTRICAL 'W'ABP STOP MOTION FOR LOOMS.

Application filed December 21 1927. Serial No. 241,672.

This invention relates to improvements in electrical warp stop motions more particularly adapted for use on loomsand it is the general object of the invention to provide an improved form of electrically operating warp stop motion which shall indicate visuallythe location of the warp, fault. I

It is an important object of my present invention to provide a plurality of spaced wires, prongs or needles such as are presented by card clothing and to arrange said needles in groups of diflerent electrical potentials, the needles or prongs oi"? the two difierent groups being close enough to bebridged by a raised drop wire. I p

It is a further object of my invention to provide means for raising a fallen drop wire and holding the same in raised position not only to establish an electric circuit but also to indicate the location of the Warp fault.

It is a further object of my invention to provide a flexible device to extend through slots provided in the upper ends of the drop wires and to give said flexible devices a quick whipping motion at periodic intervalsso that any drop wire which may have fallen upon it will be shot upwardly and be lodged between the various wires located thereabove. it is suflicient for the purposes of the present invention it the flexible cord lies under a part of the fallen drop wire without necessarily passing through the slots.

Vlith these and other objects in view which will appear the description proceeds, my invention resides in. the combination and arrauo'ement of parts hereinafter described and set forth in the claims. a

in the accompanying drawings wherein l have shown a convenient embodiment of my invention, I I

Fig. 1 is a top view of a portion of a loom having my invention applied thereto,

Fig. 2 is a rear elevation taken in the di rection of arrow 2, Fig. Land showing the flexible device in slackened position in full lines,

Fig. 3 is a detailed end elevation taken in the direction of arrow 3, Fig. 2, I

Fig. l is an enlarged vertical section taken on line dl t 1,

Fig. 5 is an enlarged vertical transverse section taken on line 5-5 of Fig. 2, and.

Fig. 6 is an enlarged vertical section on line 66. of

. Vi hile the invention set forth herein isapphcable to any 11180111118 acting in con auction with a series oft warp threads, yet I havechosen to illustrate the same in connection with a loom and have indicated a loom frame .10 in which a bottom shaft 11 is caused to rotate by mechanisn'i not shownbut wellunderstood. A warp beam 12 is mounted for rotation in the loom and supplies a warp which controlledby the various loom instrumentalities not shown herein. The warp passes over a whip roll 13 and then extends in a sub s-t'antialiy horizontal plane toward thelhar nesses. The breast beam B is provided with so-called shipper mechanism including a shipper lever 14: received in a not-ch15 formed in the right hand end of aslot 15 as viewed in Fig. 1 and an electromagnet 16 is positioned to act upon a lever 17pivoted at 18 to the breast beam. The effect of said lever when actuated by the magnetis to move the shipper handle 14 out of the notch into the slot, a condition which is accompanied by stopping of the loom. A battery 19 isprovided to supply the necessary energy for energizing the magnet 16 and said battery is connected to the magnet by a wire 20. The matter thus far described is either of common construction ordoes not enter specifically into my present invention, the electrical feature being merely illustrative assetting forth a convenient way of stoppingthe loom when the n'lagnet 16 is energized.

In cz'irrying my invention into elicct I provide means whereby i'ihebattery may be electrically connected to the magnet whenever a fault occurs in one or another of the I and to this end i provide a warp threads \V pair ot' brackets 30, one at each side of the loom, and mount thereon a plurality of spaced separator bars 31 and also a guidebar 32 shown pzrticularly in Fig. 5. I provide-a plurality of drop wires 33 each provided in the upper portion thereof with a vertical slot 34 and having. in the lower portion thereof another slot 35 to receive the guide bar 32,lhe upper end of slot 35 torn'iino; a supporting surface'36which rests on the warp thread. It isto be understood that there is one drop wire for each of the warp threads W and that the drop Wires are arranged in a bank extendmg across the warp threads and located between the separator bars 31 and held against turning about a vertical axis by p Land the guide bar 32. The warp threads support the drop wires and hold them in normal raised position.

My present invention is designed fol-coo 'jeration with a'device for'raising a "fallen drop wire to a position where the latter may complete an electrical circuit to effect stop ping of the machine to whichthe warp stop motion is applied, and ,in carrying this part of my invention into eifect-Tprovide one of the brackets 30, the one at the right as shown in Figs. 1 and 2, with a screw or stud 40 and supportthe rightliand end of a flexible element or cord 41. The other end of said cord extends over a. sheave 42 pivotally mounted on a fixed stud 48 whieh may be carried by the left hand bracket- 30. The vertical portion of the cord is received'by an eye bolt 44 mounted on a lever 45 .pivoted as at 46 to a larger. lever 47. Lever '47 is pivoted as at 48 to the loom frame and carries an adjustable stop screw 49 .to engage a fixed stop '50. A roll 51 rotatable on the lever 45 engages a spiral cam 52 secured adjustably asto angular position on bottom shaft 11. The cam has'a high point 53 and an abrupt fall 54 to permit the lever 47 to fall quickly wheirthe shaft 11 reaches a predetermined angular position. The' stop pin 55 on lever 47 holds the roll in proper position to cooperate with the cam and if the loom be turned backwardly lever 45 can turn about its axis against the action of a torsion spring 56 interposed between stud 46 and lever 45 and tending to hold the latter against the pin 55.

During the operation ofthe loom the bottom shaft turns every second pick of .the'loom so that the cam 52 operates through thelever 47 to cause a sudden straightening of the cord 41 so that the same moves 1 from' the curved form shown in full lines to a straight position shown in. dotted lines in Fig. 2. Should a drop wire be fallen at the time the cord is straightened said drop wire will be engaged by the cord and given a quick upward movement to move above the other'drop wires.

I have shown herein one particular means for raising a fallen drop wire but it is to be understood that the electrical part of the de vice set forth herein operates independently of the mechanism which raises a fallen drop wire and. is dependent merely upon the fact that the drop wire is raised without reference to the manner of its raising.

Stands 60, one at each end of the loom, support a plate 61 to the underside ofwhich may be secured an inverted channel member 62 made preferably of insulating material such as fiber. A strip of card clothing eanmy be securedto said channel member l 62 shown inFigL'5. The teeth or needles'*64 which are carried byithe card clothing are arranged in two differentgroiips. As shownin Fig. 5 one group A; isfomiedtf two staggered sets of inverted U-s haped wires, one set 65 overlapping the other section 66 by a small amountto permit the passage of an electric "conducting wire 67. This Wire is in electri- C-ill'COlliJtiCb with all 'thGWllGS 65 and 66 and is connected by wire 68 to the magnet 16. The other group C of wires is similarly formed and is associated with an electric wire 69 which may be connected by wire 70 to that side of the battery 19 which is opposite the-wire 20.

Iti'stobe understood that the wires of the card clothing are all in contact with the electric conducting wires, the wires of onegroup being connected to one side of the circuit andthe wires of the other group being connected to the opposite sides of the circuit and that the groups are disposed as shown in Fig. 5 so: that a 'dropwire which is shot upwardly by the cord41 will be required to engage at least one wire of each group.

There will be a pair of'groups of needles 64 for each bank of 'dropwvires and the principle illustrated in connection with 1 can be extended to a loom provided with several banks of drop wires. The closing of the circuit is facilitated by the shape of the teeth on needles 64. Itwill be'seen by referring to Fig. that said wires extend through the cloth 63 in'a direction substantially perpendicular to the cloth but that the lower ends are bentor inclined slightly as indicated at 71. Thave found that this slight bend, which is characteristic of mo-st forms of card cloth ingand need not-"be made especially for the application shown herein,assists in bringing about more intimate electrical contact hetween the wires 64and the upper part of the raised drop wire.

The teeth or needles 64 hold drop wire which has been raised into engagement with them to indicate the location'of the warp fault.

From the foregoing it will be seen that I have provided an electrical warp stop motion wherein a large number of small wires or prongs are arranged in two electrically separated groups placed suificiently close together, however, so that the groups may be connected together electrically by a raised drop wire. It will also be seen that I have provided a warp stop motion employing a flexible cord device which is effective to raise a fallen drop wire at selected times ineansbeing provided to stop' the loom under these circumstances. It will be'seen that the cainwhich controls the whipping of the cord 41 1s angularly adjustable on the bottom shaft so that the time of stopping in the cycle of the loom may be adjusted as desired. It'will'also be seen that the prongs or wires of the card clothing hold the raised'drop wire 'toindicate the l cation of the warp fault.

While I have shownherein card clothing as the means for establishing electrical confill tact with the raised drop wire yet ldo not wish to be limited to the niiaterial which is definitely recognizable in the trade by the term card clothing as n equivalent construction and disposi. l of wires and needles will accomplish the same resilt as tions may be made therein by those shilledin the art without departing from the sp and scope of the invention and i do not wish to be limited to the details herein disclosed, but what I claim is:

l. in an electrical warp stop motion for looms having a bank of drop wires supported normally in raised position by the warp threads together with means for raising a drop wire corresponding to a broken warp thread to a position above the oth r drop wires, a pair of spaced groups of droo wire holding elements, the elements of each group being electrically connected together and being insulated from the elements of the other group, the elenients of both groups being sufliciently close together to be bridged by and electrically connected through a raised drop wire, and means to stop the loom when a drop wire is raised into electrical contact with elements of both groups.

2. in electrical warp stop motion for looms having a bank of drop wires supported normally in raised position by the warp threads together with means for raising a drop wire corresponding to a broken warp thread to a position above the other drop wires, card clothing located above the drop wires normally supported by the warp threads, the prongs of said card clothing being separated into two groups, the prongs of each group being electrically connected to .lt'll other anl insulated from the wires of the other group, said groups being close mough together to hare electric contact with a raised drop wire, and eleetroinagnetic means to stop the loom when a raised drop wire electrically connects the groups of wires together.

in an electrical warp stop motion for looms having a bank of drop wires supported normally in raised position by the warp threads together with means for raising a drop wire corresponding to a broken warp thread to a position above the other drop wires, card clothing located above the normal position of the drop wires supported by the warp threads, the prongs of the card clothing being separated into two groups, the

prongs of each group being electrically conuected togethe and insulated from the wires of the other group, said prongs depending from the card clothing and having the lower ends inclined to a vertical line, a drop wire which is raised above the other drop wires of the bank engaging prongs of both groups to connect said groups together electrically, and electromagnetic meansto stop the loom when said groi. s electrically connected togethen 4., in a warp stop motion for a loom having a bank of drop wiresnormally supported in raised position by trio warp threads of the loom, a normally slack ii tit e element extending under a portion of each of the drop wires, means to tighten the flexible element to cause the same to give a quick upward movement to a fallen drop wire supported temporarily by the element, andmeans to engage and hold in raised position any drop wire which niay be moved upwardly by the element. I

- 5. In a warp stop motion for hlOOll'l having' a bank of drop wires normally held in raised position by the warp threads in the loom, a normallyslack flexible element extending under a portion of each drop wire, a drop wire holding device located above the warp threads ano above the normal posit-ion of the drop wires supported by the warp threads, and means to tighten the flexible element to cause the latter to give the fallen drop wire supported thereby a quick upward movement toward said holding means, whereby the location of the warpfault may be indicated visually. Y

6. In a warp stop motion for a loom havi ng a bank of drop wires normally supported in raised position by the w rp threads, a

normally slack flexible element extending under a portion of each of the drop wires, and means whereby said flexible element may be tightened to give a quick upward movement to a fallen drop wire supported temporarily by the element to indicate the location of the warp fault.

7. In a warp stop motion, a bank of drop wires each provided with a slot in the upper portion thereof, a flexible element extending through the slots of the drop wires and nor mally in slacl: position, means to periodically tighten said flexible element to render the same taut to impart an upward ll'lOVQll'lQDt to a fallen drop wire, and means to eliect a change in the machine to which the stop motion is applied when the drop wire is moved to raised position by the tighte ing of the flexible element. i

S. In a warp stop motion for a loom having a plurality of drop wires each of which is provided with a slot and the drop wires so arranged that the slots are in substantial alignment, a normally slack flexible elen'ient extending through the aligned slots of the drop wires, means to tighten said element at periodic ii'itervals so that said element will impart an upward movement to any drop wire which may be in fallen position and temporarily supported by said element, and

means to stop the loom when any drop wire has been raised by the flex ble element.

9. In a Warp stop motion to control the operation of a machine, a. bank of drop wires supported normally by the Warp thr ads, a flexible device normally slack and lying under a portion of each of the drop wires means to tighten the flexible element to cause the saine totengage and lift a fallen drop Wire, and means to stop the machine when the drop Wire lifted by said flexible element.

10 vIn a Warp stop motion :tor a loom having a rotating shaft and a group (it drop-wires supported normally in raised position by the warp threads, a fl xible element 1io7.'i1'1al.ly slack and extending under a portion each of the drop wires, means operated from the shaft to cause a periodic tightening ofthe flexible element to cause the latter to raise it fallen drop Wire to a position above the other drop Wires and means to stop the loom when a fallen drop Wire is raised by said flexible element.

11. In a Warp stop motion for a loom having a rotating; shaft, a=bank ot drop Wires normally supported in raised position by the Warp threads, a cam mounted in adjusted angular position on shaft, a flexible element normally slack a d extending under a portion of each of he drop Wires, connections between said flexible element and the cam to tighten said flexible element at periodic intervals in the operation of the teen the-particular time and the cycle of the revolntionot the loom being determined by the angular p ,sition ofthe cam relativelyto the rotating shaft, and means to stop the loom when the flexible element engages a fallen drop Wire to raise thesamo at the time the flexible element is being tightened.

In testimony whereol I have hereunto affixed my signature.

RICHARD -i G. TURNER. 

